<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
const obj = {
    name: "xiaohong",
    yimiao: [
        '第一针',
        '第二针',
        '第三针'
    ],
    [Symbol.iterator]() {
        //索引变量
        let index = 0;
        let _this = this;
        return {
            next:function () {
                if (index < _this.yimiao.length) {
                     const result =  {value: _this.yimiao[index], done: false}
                     //下标自增
                     index++;

                     return result;
                } else {
                    return {value: undefined, done: true}
                }               
            }
        }
    }
}

//遍历这个对象

for (let v of obj) {
    console.log(v, 'vvvvvv');
}
    </script>
</body>
</html>